Solutions by everydaycalculation.com
79 - 57 is 463.
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Related: 14/9-5/7 7/9-10/7 7/18-5/7 7/9-5/14 21/9-5/7 7/9-15/7 7/27-5/7 7/9-5/21 35/9-5/7 7/9-25/7 7/45-5/7 7/9-5/35 49/9-5/7 7/9-35/7 7/63-5/7 7/9-5/49
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